We discuss the computational aspects of wide area networks, and we describe various facets of a process calculus devised to embody mobility, security, and wide area network semantics. These lecture notes are an abridged version of [8, 11, 27, 12, 13]. Part I: Wide Area Computation

This paper examines the issue of dynamically scheduling applications on a wide-area network computing system. We construct a simulation model for wide-area task allocation problem and study the performance of the proposed algorithm under different conditions. The simulation results indicate that the wide-area scheduling algorithm is sensitive to several parameters including machine failure rate...

Recent developments in the area of smart structures indicate that variable geometry / stiffness truss network is of fundamental importance in designing smart transformable structures and systems for space applications. This paper presents the conceptual design and dynamic modeling of a cooperative re-configurabel dual-arm robotic structure called Dual-Arm Cam-Lock Manipulator. The Manipulator i...

量子卫星通信是通信领域的研究热点和前沿, 具有理想的信息安全性和覆盖面广的优势, 对于构建全球范围的量子卫星广域网具有重要意义, 而远距离传输信息时网络的可靠性、安全性和路由中继等问题仍需改进. 为了构建性能良好的量子卫星广域网, 本文提出利用蜘蛛网作为一种独特的自然通信拓扑结构, 将自然界蛛网演进为人工蛛网拓扑, 量子信息的传输采用N阶量子隐形传态路由方案, 其传输时延基本不变, 在此基础上构建蛛网网络拓扑量子广域网传输模型, 并对构建的网络模型的误码率、吞吐率、安全密钥生成率进行仿真分析. 用抗毁度作为衡量网络拓扑结构可靠性的指标, 以9节点环型网和9节点蛛网为例进行定量和定性分析, 得出蛛网拓扑具有更高的可靠性. 当噪声的平均功率谱密度给定且不存在中继时, 量子态的传输距离越大误码率越大, 这时要考虑引入中继; 当传输距离和噪声功率谱密度一定的情况下, 误码率随着...

Recent developments in the area of smart structures indicate that variable geometry / stiffness truss network is of fundamental importance in designing smart transformable structures and systems for space applications. This paper presents the conceptual design and dynamic modeling of a cooperative re-configurabel dual-arm robotic structure called Dual-Arm Cam-Lock Manipulator. The Manipulator i...

As networks become an essential ingredient of modern business and government systems, there is an increasing demand for specialization for network services that can be tailored to the needs of individual organizations, especially for wide-area network connectivity. Currently, Internet service providers can only offer their clients very limited forms of customization simply because existing wide...